hımm a new list!! Haven’t seen any of them before except Triplagent. The best flat design I ve seen lately is http://fixedagency.com/ .It would be a great addition to this list. Absolutely love flat design!!

this is quite a list, must have taken a while to put together, so props to you and the effort is appreciated. I was looking for some samples to check out and perhaps gain inspiration from, this list is picture perfect.